Use the substitution method to solve the following system of equations:

4x − y = 3
7x − 9y = −2

x=1

y=1

Step-by-step explanation:

First step, we isolate one variable from one equation. Let's isolate y from the first equation:

Next we substitute the y value in the second equation:

Now, we replace the x value in the equation where y is isolated:

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

the anwser is d) 75°

step-by-step explanation: