17-05-2016
Mathematics

contestada

how can I solve this system of linear equations by substitution 3x-2y=9 and y=2x-7

Respuesta :

apologiabiology apologiabiology

17-05-2016

y=2x-7
therfor we can SUBSITUTE 2x-7 for y whereever we see y in the other equation

3x-2(2x-7)=9
3x-4x+14=9
-x+14=9
minus 14 both sides
-x=-5
mulitly -1
x=5

sub back

y=2x-7
y=2(5)-7
y=10-7
y=3

(5,3)

Answer Link

Otras preguntas

What explorers sailed for Portugal?

Given these equations: x+y=9.0 0.50x+0.20y=3.15 Find the values of x and y.

what fraction is the same as 0.2?

Which ordered pairs make the inequality true? x + 3y < 9 Choose all answers that are correct. (Points : 1) (–2, 3) (–1, 4) (1, 3)

Selma spent 7/10 of her allowance on a new backpack. What percent of her allowance did she spend

is a wolf a carnivore, herbivore,or a omnivore

2 wires help support a tall pole. 1 wire forms an angle of 48 degrees with the ground and the other wire forms an angle of 72 degrees with the ground The wir

Which statements describe factors that led to the decline and defeat of the Aztec Empire? Choose all answers that are correct. A. The Spanish attempt to recruit

On the U.S Constitution what is Amendment XIV about? Summarize.

How do write 3 15/44 as a decimal